Can we identify blood specificity at time of CR vs non on CR? Shall we distinguish CR with sunitinib alone from combined CR (sunitinib with local treatment), while in clinical report these 2 cohorts present similar time to recurrence (ALBIGES, ASCO 2010)? Can we identify potential predictive serum biomarkers of recurrence? (With the aim of isolating blood biomarker that can help on treatment discontinuation decision?)